I donâ€™t have a problem, but sometimes ...

I don’t have a problem, but sometimes I just love the way this system works.
I got the message {"Cannot convert object of type 'System.Int64' to object of type 'System.Data.SqlTypes.SqlInt32'."} {System.Data.DataException}

This was the command
System.Data.DataRow dr_Test0 = this.XML_DataSet.Tables[0].NewRow();

AH HA! Because I asked it to be auto incrementing, I have to use long/Int64 for the field. The code of course doesn't know anything about the valid types while forcing a cast to long. And the only way I see the problem is because of a cast to long and I find the problem because of a runtime error. (AND NOT when I create the row, but when I try to get a copy of the row.)
Never mind I'll never produce over 2 billion rows of memory. (or that, I'm pretty sure 2 billion rows would wipe out my 4GB of virtual memory.)
Never mind I could probably declare the SQL server's identity field as small int and never blow up.